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Speaking after analysing videos of Mr Brown discussing a range of topics, James McBrien, of Clearwater, a London consultancy, said the Prime Minister risks alienating more voters unless he appears more optimistic.

Mr McBrien said: "My advice would be to relax and allow yourself to smile a bit more, especially when talking about upbeat news. People warm to friendliness and are less attracted to fearful, glum or angry characters.

"As a leader, people need to trust you. How you communicate speaks volumes about how you will act."

A Downing Street spokesman said: “Yes, it’s true. The Prime Minister has a personal trainer. He looks after his health just as millions of other people in Britain do.”